Java implements a tool class to determine whether the IP is in the specified IP range

import org.apache.commons.lang.StringUtils; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import javax.servlet.http.HttpServletRequest; public class IPUtil { /** * 获得当前ip * @return */ public static String getIP(){ ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); if(servletRequestAttributes == null) { return "127.0.0.1"; } HttpServletRequest request = servletRequestAttributes.getRequest(); String ip = request.getHeader("x-forwarded-for"); if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("WL-Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("HTTP_CLIENT_IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("HTTP_X_FORWARDED_FOR"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getRemoteAddr(); } if ("0:0:0:0:0:0:0:1".equals(ip)) { ip = "127.0.0.1"; } return ip; } /** * 判断IP是否在指定范围 * @param ipStart * @param ipEnd * @param ip * @return */ public static boolean ipIsValid(String ipStart,String ipEnd, String ip) { if (StringUtils.isEmpty(ipStart)) { throw new NullPointerException("起始IP不能为空！"); } if (StringUtils.isEmpty(ipEnd)) { throw new NullPointerException("结束IP不能为空！"); } if (StringUtils.isEmpty(ip)) { throw new NullPointerException("IP不能为空！"); } ipStart = ipStart.trim(); ipEnd = ipEnd.trim(); ip = ip.trim(); final String REGX_IP = "((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)"; final String REGX_IPB = REGX_IP + "\\-" + REGX_IP; if (!ipStart.matches(REGX_IP) || !ip.matches(REGX_IP) || !ipEnd.matches(REGX_IP)) { return false; } String[] sips = ipStart.split("\\."); String[] sipe = ipEnd.split("\\."); String[] sipt = ip.split("\\."); long ips = 0L, ipe = 0L, ipt = 0L; for (int i = 0; i < 4; ++i) { ips = ips << 8 | Integer.parseInt(sips[i]); ipe = ipe << 8 | Integer.parseInt(sipe[i]); ipt = ipt << 8 | Integer.parseInt(sipt[i]); } if (ips > ipe) { long t = ips; ips = ipe; ipe = t; } return ips <= ipt && ipt <= ipe; } }